Changed order of parameters in the SyntaxError constructor to make creating error with unknown location easier. Also fixes bug with reporting of invalid ranges such as [b-a] in the metagrammar.

lib/runtime.js

@@ -181,9 +181,9 @@ PEG.Parser.prototype = {
     if (result === null || this._pos !== input.length) {
       var errorPosition = computeErrorPosition();
       throw new PEG.Parser.SyntaxError(
+        buildErrorMessage(),
         errorPosition.line,
-        errorPosition.column,
-        buildErrorMessage()
+        errorPosition.column
       );
     }
 
@@ -230,11 +230,11 @@ PEG.Parser.NamedRuleMatchFailure.prototype = {
 
 /* Thrown when a parser encounters a syntax error. */
 
-PEG.Parser.SyntaxError = function(line, column, message) {
+PEG.Parser.SyntaxError = function(message, line, column) {
   this.name = "PEG.Parser.SyntaxError";
+  this.message = message;
   this.line = line;
   this.column = column;
-  this.message = message;
 };
 
 PEG.Parser.SyntaxError.prototype = Error.prototype;